It is written clearly in the requirements that all passengers check onto board 30 minutes

发布时间：2020-08-16 19:24:37

It is written clearly in the requirements that all passengers      check onto board 30 minutes before the plane takes off.
A. may
B. can
C. will
D. shall

网友回答

A. may
B. can
C. will
(答案→)D. shall
解析：requirements当要求讲，后面的同位语从句that all passengers      check onto board 30 minutes before the plane takes off.应该用（should）+do的虚拟语气，
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